At the Department of Justice, where former Attorney General Loretta Lynch last year delivered an impassioned speech telling transgender Americans, “We see you; we stand with you,” her successor, Jeff Sessions, wasted no time reversing course. The Justice Department in February withdrew guidance issued to schools on the treatment of transgender students, signaling that it would no longer consider their rights to be protected under a 1972 civil rights law.

The Department of Health and Human Services, which worked to expand access to health care for gay and transgender Americans, is now being led by Tom Price, who was a vocal opponent of gay rights as a congressman. The agency’s civil rights office, which oversaw regulatory changes that made it easier for transgender people to get insurance coverage for medical care, is now run by Roger Severino, an ultraconservative activist who last year accused the Obama administration of attempting to “coerce everyone, including children, into pledging allegiance to a radical new gender ideology.”

Mr. Obama’s last secretary of the Army, Eric Fanning, an openly gay man, was instrumental in nudging the Pentagon brass to allow transgender people to serve openly. Mark Green, a Tennessee state senator nominated to replace him, last year called being transgender a “disease.”